*I think you meant EV (Effort Value) training. EV training boosts a special Stat you are training for by defeating Pokemon that give off EV points of that Stat. Every 4 EVs you gain for a stat adds an extra stat point to the designated stat.

Lucario's Speed, for example, is 306, I think, at max. That's with a Boosted nature (ex. Jolly or Hasty) and Perfect IVs (explained below by Dr. Flame) . Without 252 EVs for that stat, but still the same IVs and nature, the max would be ...237.